Home / What is fruit sugar and why it is bad for diabetic persons? What is fruit sugar and why it is bad for diabetic persons? By Rohan Verma Fruits contain natural sugar Fructose. This is decomposed to glucose and released into the bloodstream. It is not bad. It is good for our body. Only excessive fructose levels can harm you if you are diabetic. Share Tweet Pin it Reddit Share Written by Rohan Verma